Exception in XML:DB API

I'm trying to call an XML:DB xpl as discribed in
http://www.orbeon.com/ops/doc/processors-xmldb#xmldb
http://www.orbeon.com/ops/doc/processors-xmldb#xmldb

following is my xpl


<p:config xmlns:p="http://www.orbeon.com/oxf/pipeline"
         xmlns:oxf="http://www.orbeon.com/oxf/processors">

   <p:param name="data" type="output"/>

       <p:processor name="oxf:xmldb-query">
               <p:input name="datasource" href="datasource.xml"/>
               <p:input name="query">
                       <xdb:query collection="/db" create-collection="true">
                               xquery version "1.0";

                               <files>
                                  {
                                      for $file in xmldb-query:get-child-collections('/db')
                                      order by $file
                                      return
                                      <file>
                                        {$file}
                                      </file>
                                  }
                               </files>

                       </xdb:query>
               </p:input>
               <p:output name="data" ref="output" debug="true"/>
       </p:processor>


When i run the application, i get The prefix "xdb" for element "xdb:query"
is not bound Exception.

what did i miss here?

Regards,
Safraz
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